gtk.Main

class Main ;

Description Before using GTK+, you need to initialize it; initialization connects to the window system display, and parses some standard command line arguments. The gtk_init() function initializes GTK+. gtk_init() exits the application if errors occur; to avoid this, use gtk_init_check(). gtk_init_check() allows you to recover from a failed GTK+ initialization - you might start up your application in text mode instead. Like all GUI toolkits, GTK+ uses an event-driven programming model. When the user is doing nothing, GTK+ sits in the main loop and waits for input. If the user performs some action - say, a mouse click - then the main loop "wakes up" and delivers an event to GTK+. GTK+ forwards the event to one or more widgets. When widgets receive an event, they frequently emit one or more signals. Signals notify your program that "something interesting happened" by invoking functions you've connected to the signal with g_signal_connect(). Functions connected to a signal are often termed callbacks. When your callbacks are invoked, you would typically take some action - for example, when an Open button is clicked you might display a GtkFileSelectionDialog. After a callback finishes, GTK+ will return to the main loop and await more user input. Example1.Typical main function for a GTK+ application int main (int argc, char **argv) { /+* Initialize i18n support +/ gtk_set_locale (); /+* Initialize the widget set +/ gtk_init (argc, argv); /+* Create the main window +/ mainwin = gtk_window_new (GTK_WINDOW_TOPLEVEL); /+* Set up our GUI elements +/ ... /+* Show the application window +/ gtk_widget_show_all (mainwin); /+* Enter the main event loop, and wait for user interaction +/ gtk_main (); /+* The user lost interest +/ return 0; } It's OK to use the GLib main loop directly instead of gtk_main(), though it involves slightly more typing. See GMainLoop in the GLib documentation.

static void init (char[][] args);

Call this function before using any other GTK+ functions in your GUI applications.

static void initMultiThread (char[][] args);

This initiates GtkD to supports multi threaded programs. read full documantation at http://gtk.org/faq/#AEN482 from the FAQ: "There is a single global lock that you must acquire with gdk_threads_enter() before making any GDK calls, and release with gdk_threads_leave() afterwards throughout your code." This is to be used on any call to GDK not executed from the main thread.

static char[] setLocale ();

Initializes internationalization support for GTK+. gtk_init() automatically does this, so there is typically no point in calling this function. If you are calling this function because you changed the locale after GTK+ is was initialized, then calling this function may help a bit. (Note, however, that changing the locale after GTK+ is initialized may produce inconsistent results and is not really supported.) In detail - sets the current locale according to the program environment. This is the same as calling the C library function setlocale (LC_ALL, "") but also takes care of the locale specific setup of the windowing system used by GDK.

Returns:
a string corresponding to the locale set, typically in theform lang_COUNTRY, where lang is an ISO-639 language code, andCOUNTRY is an ISO-3166 country code. On Unix, this form matches theresult of the setlocale(); it is also used on other machines, such as Windows, where the C library returns a different result. The string is owned by GTK+ and should not be modified or freed.

static void disableSetlocale ();

Prevents gtk_init(), gtk_init_check(), gtk_init_with_args() and gtk_parse_args() from automatically calling setlocale (LC_ALL, ""). You would want to use this function if you wanted to set the locale for your program to something other than the user's locale, or if you wanted to set different values for different locale categories. Most programs should not need to call this function.

static PgLanguage getDefaultLanguage ();

Returns the PangoLanguage for the default language currently in effect. (Note that this can change over the life of an application.) The default language is derived from the current locale. It determines, for example, whether GTK+ uses the right-to-left or left-to-right text direction. This function is equivalent to pango_language_get_default(). See that function for details.

Returns:
the default language as a PangoLanguage, must not befreed

static int parseArgs (int* argc, char*** argv);

Parses command line arguments, and initializes global attributes of GTK+, but does not actually open a connection to a display. (See gdk_display_open(), gdk_get_display_arg_name()) Any arguments used by GTK+ or GDK are removed from the array and argc and argv are updated accordingly. You shouldn't call this function explicitely if you are using gtk_init(), or gtk_init_check().

Params:

int* argc	a pointer to the number of command line arguments.
char*** argv	a pointer to the array of command line arguments.

Returns:
TRUE if initialization succeeded, otherwise FALSE.

static void init (int* argc, char*** argv);

Call this function before using any other GTK+ functions in your GUI applications. It will initialize everything needed to operate the toolkit and parses some standard command line options. argc and argv are adjusted accordingly so your own code will never see those standard arguments. Note that there are some alternative ways to initialize GTK+: if you are calling gtk_parse_args(), gtk_init_check(), gtk_init_with_args() or g_option_context_parse() with the option group returned by gtk_get_option_group(), you don't have to call gtk_init(). Note This function will terminate your program if it was unable to initialize the GUI for some reason. If you want your program to fall back to a textual interface you want to call gtk_init_check() instead. Note

Params:

int* argc	Address of the argc parameter of your main() function. Changed if any arguments were handled.
char*** argv	Address of the argv parameter of main(). Any parameters understood by gtk_init() are stripped before return.

static int initCheck (int* argc, char*** argv);

This function does the same work as gtk_init() with only a single change: It does not terminate the program if the GUI can't be initialized. Instead it returns FALSE on failure. This way the application can fall back to some other means of communication with the user - for example a curses or command line interface.

Params:

int* argc	Address of the argc parameter of your main() function. Changed if any arguments were handled.
char*** argv	Address of the argv parameter of main(). Any parameters understood by gtk_init() are stripped before return.

Returns:
TRUE if the GUI has been successfully initialized, FALSE otherwise.

static int initWithArgs (int* argc, char*** argv, char[] parameterString, GOptionEntry* entries, char[] translationDomain, GError** error);

This function does the same work as gtk_init_check(). Additionally, it allows you to add your own commandline options, and it automatically generates nicely formatted --help output. Note that your program will be terminated after writing out the help output. Since 2.6

Params:

int* argc	a pointer to the number of command line arguments.
char*** argv	a pointer to the array of command line arguments.
char[] parameterString	a string which is displayed in the first line of --help output, after programname [OPTION...]
GOptionEntry* entries	a NULL-terminated array of GOptionEntrys describing the options of your program
char[] translationDomain	a translation domain to use for translating the --help output for the options in entries with gettext(), or NULL
GError** error	a return location for errors

Returns:
TRUE if the GUI has been successfully initialized, FALSE otherwise.

static GOptionGroup* getOptionGroup (int openDefaultDisplay);

Returns a GOptionGroup for the commandline arguments recognized by GTK+ and GDK. You should add this group to your GOptionContext with g_option_context_add_group(), if you are using g_option_context_parse() to parse your commandline arguments. Since 2.6

Params:

int openDefaultDisplay

whether to open the default display when parsing the commandline arguments

Returns:
a GOptionGroup for the commandline arguments recognized by GTK+

static void exit (int errorCode);

Warning gtk_exit is deprecated and should not be used in newly-written code. Use the standard exit () function instead. Terminates the program and returns the given exit code to the caller. This function will shut down the GUI and free all resources allocated for GTK+.

Params:

int errorCode

Return value to pass to the caller. This is dependent on the target system but at least on Unix systems 0 means success.

static int eventsPending ();

Checks if any events are pending. This can be used to update the GUI and invoke timeouts etc. while doing some time intensive computation. Example2.Updating the GUI during a long computation. /+* computation going on +/ ... while (gtk_events_pending ()) gtk_main_iteration (); ... /+* computation continued +/

Returns:
TRUE if any events are pending, FALSE otherwise.

static void run ();

Runs the main loop until gtk_main_quit() is called. You can nest calls to gtk_main(). In that case gtk_main_quit() will make the innermost invocation of the main loop return.

static uint level ();

Asks for the current nesting level of the main loop. This can be useful when calling gtk_quit_add().

Returns:
the nesting level of the current invocation of the main loop.

static void quit ();

Makes the innermost invocation of the main loop return when it regains control.

static int iteration ();

Runs a single iteration of the mainloop. If no events are waiting to be processed GTK+ will block until the next event is noticed. If you don't want to block look at gtk_main_iteration_do() or check if any events are pending with gtk_events_pending() first.

Returns:
TRUE if gtk_main_quit() has been called for the innermost mainloop.

static int iterationDo (int blocking);

Runs a single iteration of the mainloop. If no events are available either return or block dependent on the value of blocking.

Params:

int blocking

TRUE if you want GTK+ to block if no events are pending.

Returns:
TRUE if gtk_main_quit() has been called for the innermost mainloop.

static void doEvent (Event event);

Processes a single GDK event. This is public only to allow filtering of events between GDK and GTK+. You will not usually need to call this function directly. While you should not call this function directly, you might want to know how exactly events are handled. So here is what this function does with

Params:

Event event

An event to process (normally) passed by GDK.

static void grabAdd (Widget widget);

Makes widget the current grabbed widget. This means that interaction with other widgets in the same application is blocked and mouse as well as keyboard events are delivered to this widget.

Params:

Widget widget

The widget that grabs keyboard and pointer events.

static Widget grabGetCurrent ();

Queries the current grab of the default window group.

Returns:
The widget which currently has the grab or NULL if no grab is active.

static void grabRemove (Widget widget);

Removes the grab from the given widget. You have to pair calls to gtk_grab_add() and gtk_grab_remove().

Params:

Widget widget

The widget which gives up the grab.

static void initAdd (GtkFunction funct, void* data);

Registers a function to be called when the mainloop is started.

Params:

GtkFunction funct	Function to invoke when gtk_main() is called next.
void* data	Data to pass to that function.

static void quitAddDestroy (uint mainLevel, ObjectGtk object);

Trigger destruction of object in case the mainloop at level main_level is quit.

Params:

uint mainLevel	Level of the mainloop which shall trigger the destruction.
ObjectGtk object	Object to be destroyed.

static uint quitAdd (uint mainLevel, GtkFunction funct, void* data);

Registers a function to be called when an instance of the mainloop is left.

Params:

uint mainLevel	Level at which termination the function shall be called. You can pass 0 here to have the function run at the termination of the current mainloop.
GtkFunction funct	The function to call. This should return 0 to be removed from the list of quit handlers. Otherwise the function might be called again.
void* data	Pointer to pass when calling function.

Returns:
A handle for this quit handler (you need this for gtk_quit_remove()) or 0 if you passed a NULL pointer in function.

static uint quitAddFull (uint mainLevel, GtkFunction funct, GtkCallbackMarshal marshal, void* data, GtkDestroyNotify destroy);

Registers a function to be called when an instance of the mainloop is left. In comparison to gtk_quit_add() this function adds the possibility to pass a marshaller and a function to be called when the quit handler is freed. The former can be used to run interpreted code instead of a compiled function while the latter can be used to free the information stored in data (while you can do this in function as well)... So this function will mostly be used by GTK+ wrappers for languages other than C.

Params:

uint mainLevel	Level at which termination the function shall be called. You can pass 0 here to have the function run at the termination of the current mainloop.
GtkFunction funct	The function to call. This should return 0 to be removed from the list of quit handlers. Otherwise the function might be called again.
GtkCallbackMarshal marshal	The marshaller to be used. If this is non-NULL, function is ignored.
void* data	Pointer to pass when calling function.
GtkDestroyNotify destroy	Function to call to destruct data. Gets data as argument.

Returns:
A handle for this quit handler (you need this for gtk_quit_remove()) or 0 if you passed a NULL pointer in function.

static void quitRemove (uint quitHandlerId);

Removes a quit handler by its identifier.

Params:

uint quitHandlerId

Identifier for the handler returned when installing it.

static void quitRemoveByData (void* data);

Removes a quit handler identified by its data field.

Params:

void* data

The pointer passed as data to gtk_quit_add() or gtk_quit_add_full().

static uint inputAddFull (int source, GdkInputCondition condition, GdkInputFunction funct, GtkCallbackMarshal marshal, void* data, GtkDestroyNotify destroy);

Warning gtk_input_add_full has been deprecated since version 2.4 and should not be used in newly-written code. Use g_io_add_watch_full() instead. Registers a function to be called when a condition becomes true on a file descriptor.

Params:

int source	a file descriptor.
GdkInputCondition condition	the condition.
GdkInputFunction funct	The function to call.
GtkCallbackMarshal marshal	The marshaller to use instead of the function (if non-NULL).
void* data	callback data passed to function.
GtkDestroyNotify destroy	callback function to call with data when the input handler is removed, or NULL.

Returns:
A unique id for the event source; to be used with gtk_input_remove().

static void inputRemove (uint inputHandlerId);

Warning gtk_input_remove has been deprecated since version 2.4 and should not be used in newly-written code. Use g_source_remove() instead. Removes the function with the given id.

Params:

uint inputHandlerId

Identifies the function to remove.

static uint keySnooperInstall (GtkKeySnoopFunc snooper, void* funcData);

Installs a key snooper function, which will get called on all key events before delivering them normally.

Params:

GtkKeySnoopFunc snooper	a GtkKeySnoopFunc.
void* funcData	data to pass to snooper.

Returns:
a unique id for this key snooper for use with gtk_key_snooper_remove().

static void keySnooperRemove (uint snooperHandlerId);

Removes the key snooper function with the given id.

Params:

uint snooperHandlerId

Identifies the key snooper to remove.

static Event getCurrentEvent ();

Obtains a copy of the event currently being processed by GTK+. For example, if you get a "clicked" signal from GtkButton, the current event will be the GdkEventButton that triggered the "clicked" signal. The returned event must be freed with gdk_event_free(). If there is no current event, the function returns NULL.

Returns:
a copy of the current event, or NULL if no current event.

static uint getCurrentEventTime ();

If there is a current event and it has a timestamp, return that timestamp, otherwise return GDK_CURRENT_TIME.

Returns:
the timestamp from the current event, or GDK_CURRENT_TIME.

static int getCurrentEventState (GdkModifierType* state);

If there is a current event and it has a state field, place that state field in state and return TRUE, otherwise return FALSE.

Params:

GdkModifierType* state

a location to store the state of the current event

Returns:
TRUE if there was a current event and it had a state field

static Widget getEventWidget (Event event);

If event is NULL or the event was not associated with any widget, returns NULL, otherwise returns the widget that received the event originally.

Params:

Event event

a GdkEvent

Returns:
the widget that originally received event, or NULL

static void propagateEvent (Widget widget, Event event);

Sends an event to a widget, propagating the event to parent widgets if the event remains unhandled. Events received by GTK+ from GDK normally begin in gtk_main_do_event(). Depending on the type of event, existence of modal dialogs, grabs, etc., the event may be propagated; if so, this function is used. gtk_propagate_event() calls gtk_widget_event() on each widget it decides to send the event to. So gtk_widget_event() is the lowest-level function; it simply emits the "event" and possibly an event-specific signal on a widget. gtk_propagate_event() is a bit higher-level, and gtk_main_do_event() is the highest level. All that said, you most likely don't want to use any of these functions; synthesizing events is rarely needed. Consider asking on the mailing list for better ways to achieve your goals. For example, use gdk_window_invalidate_rect() or gtk_widget_queue_draw() instead of making up expose events.

Params:

Widget widget	a GtkWidget
Event event	an event